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Teach you how to identify counterfeit titanium dioxide?

Release time:

2024-01-29 09:38

Introduction of titanium dioxide

Chemical name of titanium dioxide: titanium dioxide, molecular formula TiO2, molecular weight 79.9, its mass composition is 59.95 Ti,O accounts for 40.05.

Alias: titanium dioxide, titanium dioxide.

Usually, people call titanium dioxide, which is mainly used for white pigments in industries such as coatings, inks, plastics, rubber, papermaking, chemical fiber, art pigments and daily cosmetics, as titanium dioxide, titanium dioxide pigment or titanium dioxide, while titanium dioxide, which is mainly used for purity in enamel, welding rod, ceramics, electronics, metallurgy and other industrial sectors, is called titanium dioxide or non-pigment grade titanium dioxide and non-coating titanium dioxide.

 

Rutile titanium dioxide, and there are two kinds of manufacturing methods, different manufacturing methods, the quality is different.

Sulfuric acid method manufacturing: large particle size, red color. The hue is not very white, gray or yellow, and the hue is different from batch to batch. Therefore, it cannot be used in high-end buildings.

Chlorination method manufacturing: fine particle size, color blue light. Hue pure white, very stable.

 

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Technical indicators of titanium dioxide:

TiO2 represents whiteness, hiding power (opacity, coloring strength), the higher the percentage content, the greater the whiteness and hiding power.

Al2O3 means dispersion, gloss, weather resistance (treated with dense aluminum), the higher the percentage content, the greater the dispersion and gloss.

SiO2 represents weather resistance (treated with dense silicon), and the higher the percentage content, the greater the weather resistance. The organic substance is coated with the organic substance, and the dispersibility (wetting) is better.

ColorL represents whiteness (brightness). The average particle size determines light scattering and hiding properties. The smaller the particle size, the more the color of titanium dioxide is blue phase.

Oil absorption affects the gloss and dispersion of the system.

The resistance value indicates the soluble salt content.

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Rutile titanium dioxide basic requirements:

TiO2 content,%(m/m)≥:97(R1), 90(R2), 80(R3); Volatile matter at 105 ℃,%(m/m)≤:0.5(R1),R2, R3 agreed; Water soluble matter,%(m/m)≤:0.6(R1), 0.5(R2), 0.7(R3); screen residue (45μm mesh),%(m/m)≤ 0.1.

Basic requirements for rutile titanium dioxide: the agreed reference sample shall meet the basic requirements.

Color: similar to the agreed reference sample; scatter force (instead of achromatic force): agreed;

After pretreatment at 23±2 ℃ and relative humidity (50±5)% for 24h, volatiles at 105 ℃,%(m/m)≤:0.5(R1), 1.5(R2), 2.5(R3);

PH value of water suspension, oil absorption and resistivity of water extract: all agreed.

 

  Due to the high price and large amount of rutile titanium dioxide, there are many counterfeit products on the market, mainly including the following aspects:

(1) the domestic titanium dioxide packaging into imported titanium dioxide

(2) with anatase titanium dioxide posing as rutile type or in the rutile type mixed with part of anatase titanium dioxide;

(3) in rutile titanium dioxide or anatase titanium dioxide mixed with calcium carbonate, lithopone, barium sulfate and other fillers.

   

Prevention and identification of counterfeit products:

(1) Imported titanium dioxide usually has its characteristics on its packaging (such as patterns, fonts, batch numbers, etc.), which can be identified on its packaging first;

(2) For anatase titanium dioxide posing as rutile type, it is difficult to distinguish with general chemical methods, and can only be identified by X-diffraction.

(3) for in titanium dioxide mixed with CaCO3, by adding dilute sulfuric acid or dilute hydrochloric acid in titanium dioxide to be identified, will produce bubbles, and will make clear lime water become turbid, it indicates that the titanium dioxide mixed with CaCO3;

(4) for titanium dioxide mixed with lide powder, adding dilute sulfuric acid or dilute hydrochloric acid will produce the smell of rotten eggs;

(5) For those mixed with BaSO4, because it cannot react with acid, it can only be identified by X-diffraction.

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